Hi all,

Have anyone ever changed transmission fluid on your NX200T, yet? Is it hard?
Do we have DIY changing transmission on file?

Thanks,
Eric

 

I haven't done it yet but as with all other Lexus/Toyota vehicles these days, the key is to properly fill transmission back to a certain level at a certain temperature. Since Toyota has removed the dipstick on all their cars now, it makes this job harder than before. Some people measure the exact amount that was drained out, refill with the same amount back and call it a day, but the best way is to use something like a techstream (or 3rd party) to monitor the transmission fluid temperature while refilling.

 

When I asked my local Lexus service manager about a transmission fluid change he stated not only is never needed but could cause more harm than good. They refused my money.

 

These days Toyota/Lexus vehicles are equipped with what they call "Lifetime Transmission Fluids". unless you race/tow/offroad heavily you would not need to change that.

 

I'm worry after 80K warranty is gone. if something happens to transmission, we're on our owned. I'm dough that anything is good for lifetime. I'm feeling better if i can change fluid every 50K.
hanks,
Eric

 

The problem with changing fluid is it can dislodge build ups (since the new fluid has more effective detergents and such) that would then block the small passage ways in the transmission causing shift issues. Effectively the trans fluid should last forever though as it's a sealed system without the effects of combustion/fuel dilution/etc. that happen in the engine that break down the oil.

 

If it helps the debate, I have a 06 IS350 with 222,000 miles and never changed the transmission "lifetime" fluid.

 

By the way, have you ever have the transmission fluid level check? By dealer or by yourself? Thanks.

 

No, I haven't

 

Thanks for reply.

 

The new Toyota/Lexus transmissions are sealed units and the fluid doesn't need to be changed.

 

On my 2017 maintenance schedule book said change Transmission Fluid at 120K miles. But in my 2017 Owner manual book said never change ( lifetime). They are not matching.

Eric

 

Ummm it's a sealed system. The shop foreman here said it does not need to be changed.. at all

 

ya, my 2015 rx trans was a sealed unit too. and the lexus dealer tried to tell me fluid changes were not needed. and the most they were willing to do was a spill n fill. which is basically useless because you only get out like 2- 2.5 quarts that way. so i took it to my local toyota dealer and they did a complete fluid exchange it was around 30,000 miles when they did it and it shifted better afterwards too. so needless to say, the NX is getting done at 30k as well.

 

So all the engineers who have designed and created this system to require no flush are wrong? The company is just stating it's sealed so they don't get to sell you another service? You see where I'm going with this? You are changing fluids that do not need to be changed. Your feeling of a better shift is in your head. The "feel" of the shift is controlled by your ECT-i so unless you rebooted that, you are not shifting differently.
You are not letting go of old ideologies on how a car is engineered. As a engineer, I can tell you things change from year to year.. we have made massive leaps. Oil lasts 20k now, internal tolerances are so exact it's measured in 0.0000 distances. Volumetric efficiency is so good on your 18 NX that is defies most basic VE calculations.
That being said, if you want to change your trans fluid, go for it. But @ 30k?! wow. "life of a vehicle" can be interpreted as around 100-150k, So a flush around those miles would make sense to me. What exactly are you thinking is happening to the fluid in 30K?